Display device

ABSTRACT

Even when gate lines are pulled around at both left and right picture frame regions, it is possible to prevent a gate wiring pattern which is constituted of the gate lines and gate-line pull-around lines and a storage wiring pattern which is constituted of storage lines and a common line which connects storage lines each other from getting over each other. The gate lines GL 1 , GL 2  are pulled around by the gate-line pull-around lines GLL 1 , GLL 2  in both left and right picture frame regions. The common lines B 2 , B 3  which connect the storage lines STL each other are formed at both left and right picture frame regions. Further, the gate wiring pattern which is constituted of the gate lines GL 1 , GL 2  and the gate-line pull-around lines GLL 1 , GLL 2  and the storage wiring pattern which is constituted of the storage lines STL and the common lines B 2 , B 3  do not cross each other.

This application is a Continuation application of U.S. application Ser.No. 10/754,557 filed on Jan. 12, 2004, now U.S. Pat. No. 6,912,036,which is a Continuation application of U.S. application Ser. No.10/235,890 filed on Sep. 6, 2002, now U.S. Pat. No. 6,710,839. Priorityis claimed based upon U.S. application Ser. No. 10/754,557 filed on Jan.12, 2004, which claims the priority date of U.S. application Ser. No.10/235,890 filed on Sep. 6, 2002, which claims the priority date ofJapanese Application Nos. 2001-300800 and 2001-349139 filed on Sep. 28,2001 and Nov. 14, 2001, respectively, and which is hereby incorporatedby reference.

BACKGROUND OF THE INVENTION

The present invention relates to a display device, and more particularlyto an active matrix type display device which forms a matrix array bymaking gate lines and data lines cross each other on one of twosubstrates and includes storage lines which constitute storagecapacities for holding lighting of pixels.

Liquid crystal display devices have been widely used as display devicesof notebook type personal computers, various monitors or various otherinformation equipment. Particularly, as display devices of portabletelephone sets or portable information terminals referred to as PDA, theliquid crystal display devices have been used in view of characteristicsthereof that the devices are small in size and light-weighted andexhibit the low power consumption. Further, the liquid crystal displaydevices each of which directly mounts a driving circuit chip on aportion of the substrate thus realizing the miniaturization as a wholehave been spreading as a main stream.

In many cases, the liquid crystal display device which is adopted bythis type of portable information terminal is constituted to supplydisplay data and driving voltages from one side of two laminatedsubstrates in view of the reduction of mounting space and easiness ofmounting of a control circuit. Particularly, the liquid crystal displaydevice for portable telephone set adopts, in many cases, a method inwhich a flexible printed circuit board is mounted on one side of twosubstrates for supplying display data and other driving voltages forfacilitating the accommodation of parts in a limited mounting space.

Although various types of liquid crystal display devices have been knowndepending on the constitution of electrodes and driving methods, here, aliquid crystal display device which is generally referred to as a TNtype is explained as an example. In this TN type liquid crystal displaydevice, a display region is formed by sealing liquid crystal in a gapdefined by laminating a first substrate and a second substrate whichconstitute a pair of substrates. On the display region of the firstsubstrate, a matrix is constituted of a large number of data lines (alsoreferred to as drain lines, signal lines or the like) which extend inthe longitudinal direction (referred to as first direction hereinafter)and are arranged in parallel in the lateral direction (referred to assecond direction hereinafter) and a large number of gate lines (alsoreferred to as scanning lines or the like) which extend in the lateraldirection which crosses the data lines at a right angle and are arrangedin parallel in the longitudinal direction, and a pixel is formed in aregion surrounded by a pair of data lines and a pair of scanning lines.

The second substrate includes counter electrodes which face pixelelectrodes in an opposed manner and are served for applying an electricfield to the liquid crystal of the pixel. In color display, the secondsubstrate also usually includes color filters of three colors. Eachpixel is formed of the liquid crystal which is sandwiched between thepixel electrode provided to the first substrate and the counterelectrode provided to the second substrate and lighting/non-lighting ofthe pixel is controlled by turning on/off a switching element (typicallya thin film transistor; TFT, referred to as thin film transistorhereinafter) formed at a corner of the pixel.

To hold a voltage of display data when the thin film transistors whichconstitute these pixels are turned on for a given period, storagecapacities (Cstg) are provided to respective pixels. Although variousmethods have been known as methods for supplying electricity to thesestorage capacities (that is, storing charge of display data supplied tothe pixels and holding the charge for a given period), there has beenknown a method which provides lines referred to as storage lines in adisplay region. These storage lines are usually formed close to andparallel to respective gate lines on the first substrate.

In plane, on the display region, the storage lines are alternatelypositioned between the scanning lines and extend in the directionparallel to the extension direction of the scanning lines. Further, thestorage lines have one ends thereof connected to a common line and thecommon line is pulled around to be connected to a given terminal formedon one side of the substrate. Conventionally, mounting of gate lines andstorage lines in this type of liquid crystal display device has beenperformed in a following manner. Here, the explanation is made assuminga liquid crystal display device which is configured such that a drivingcircuit mounting region, that is, a driving circuit chip mounting regionis provided to the first substrate, the second substrate overlaps aportion of the first substrate except for the driving circuit mountingregion, and a periphery of the overlapped portion is sealed with asealing member. Further, the explanation is made assuming that theabove-mentioned driving circuit mounting region is arranged at thelongitudinally lower side (lower side) of the liquid crystal displaydevice. Accordingly, two sides of the first substrate which are disposedadjacent to the lower side of the first substrate having the drivingcircuit mounting region are referred to as a left side and a right side.

When the data lines are formed in the first direction (longitudinaldirection, for example) of one substrate (the above-mentioned firstsubstrate, also referred to as a thin film transistor substrate) of theliquid crystal display device which is constituted by laminating twosubstrates, the gate lines are formed in the second direction (lateraldirection, for example) which cross the data lines at a right angle. Thegate lines are extended along one side (left side, for example) in thelateral direction, that is along the left side of the substrate, forexample and are pulled out to the above-mentioned driving circuitmounting region. On the other hand, the storage lines are formed betweenthe above-mentioned respective gate lines and are pulled out to theabove-mentioned driving circuit mounting region along the other side(right side, for example) in the lateral direction, that is, the rightside of the substrate by way of the common line.

However, when the gate lines are pulled out at only one side (only apicture frame region at the left side, for example) as in the case ofthe prior art, the width of the left-side picture frame region and thewidth of the right-side picture frame region differ from each other andhence, the display region is arranged such that the display region isoffset to the right from the lateral center position on the substrate.

Accordingly, by dividing the gate lines into a group of gate lines whichis pulled out from the left-side picture frame region and is extended inthe direction toward the lower side and a group of gate lines which arepulled out from the right-side picture frame region and is extendedtoward the lower side and, thereafter, by pulling out these gate linesusing both of left and right picture frame regions, the display regioncan be arranged at the center position in the lateral direction.However, in such an arrangement, when the common line to which aplurality of storage lines are connected in the conventional manner isprovided to only one side (for example, only right-side picture frameregion), the storage lines cross the gate lines and the pull-aroundlines thereof. Accordingly, it is necessary to form lines as differentlayers to make the storage lines get over the gate lines and thepull-around lines. In this case however, the disconnection is liable tooccur at the get-over portions and this constitutes a factor whichimpedes the enhancement of reliability.

Further, when the gate lines and the storage lines are made of aluminumor the like and are respectively subjected to anodization (anodicoxidation), since these lines get over each other, it is necessary toseparately form these lines and this increases the process in number andbecomes one factor which pushes up the manufacturing cost.

Accordingly, it is an object of the present invention to provide adisplay device of high display quality which can enhance the reliabilitysuch that even when gate lines are pulled out at both left and rightpicture frame regions, it is possible to provide a wiring pattern withno get-over portions between a gate wiring pattern which is constitutedof gate lines and gate-line pull-around lines and a storage wiringpattern which is constituted of storage line and a common line whichconnect storage lines to each other.

SUMMARY OF INVENTION

To achieve the above-mentioned object, in the present invention, gatelines are pulled around at both left-side and right-side picture frameregions by means of gate-line pull-around lines and, at the same time,common lines which connect storage lines with each other are formed atboth left-side and right-side picture frame regions so that a gatewiring pattern which is constituted of the gate lines and the gate-linepull-around lines and a storage wiring pattern which is constituted ofthe storage lines and the common lines form wiring patterns which do notcross each other. Further, in the present invention, the storage linesare vertically divided into upper and lower groups in the displayregion, and when the common lines which connect these storage lines areformed at both left and right picture frame regions, an auxiliary commonline which alleviates the difference in voltage between the storagelines which are divided into the upper and lower groups is provided. Toexplain the representative constitutions of the present invention, theyare as follows.

(1). In a display device comprising:

a substrate having a display region and picture frame regions which arearranged outside the display region and surround the display region;

a plurality of data lines which extend in the first direction and arearranged in parallel in the second direction which crosses the firstdirection on the display region of the substrate;

a plurality of gate lines which extend in the second direction and arearranged in parallel in the first direction on the display region of thesubstrate;

switching elements which are formed in the vicinity of crossing pointsbetween the data lines and the gate lines;

pixel electrodes each of which is formed in a region which is surroundedby the neighboring data lines and the neighboring gate lines; and

a plurality of storage lines which extend in the second direction, arearranged in parallel in the first direction alternately with the gatelines, and form storage capacities between the pixel electrodes and thestorage lines in the display region of the substrate,

the improvement is characterized in that the substrate includes aplurality of connection terminals which are formed on a first side andare connected to an external circuit, first and second gate-linepull-around lines which are respectively formed on the picture frameregions at second and third sides close to the first side and pull outthe plurality of gate lines in the direction toward the first side, andfirst and second common lines which are respectively formed on thepicture frame regions at the second and third sides and connect theplurality of storage lines each other,

a gate wiring pattern which is constituted of the plurality of gatelines and the first and second gate-line pull-around lines and a storagewiring pattern which is constituted of the plurality of storage linesand the first and second common lines are formed into wiring patternswhich do not cross each other.

(2). In the constitution (1), the storage lines are divided into a groupwhich is close to the first side and a group which is remote from thefirst side, the group which is close to the first side is connected tothe first common line, and the group remote from the first side isconnected to the second common line.

(3). In the constitution (1) or (2), at least a portion of the pluralityof storage lines is connected to the first common line and the secondcommon line.

(4). In the constitution (1), the storage wiring pattern is formed in apattern in which the storage lines are formed in a zigzag shape betweenthe first and second common lines.

(5). In the constitution (4), the first common lines are formed in aplural number and the second common lines are formed in a plural number,

the display device includes an insulation layer which has contact holesat positions which overlap the first common lines, and a first bridgingline which is formed at a position which overlaps the first common linesby way of the insulation layer and connects the plurality of firstcommon lines together, and

the display device further includes an insulation layer which hascontact holes at positions which overlap the second common lines, and asecond bridging line which is formed at a position which overlaps thesecond common lines by way of the insulation layer and connects theplurality of second common lines together.

(6). In any one of the constitutions (1) to (5), the plurality ofconnection terminals includes a feeding pad for applying a voltage tothe storage wiring pattern.

(7). In any one of the constitutions (1) to (6), the plurality of gatelines and the plurality of storage lines are formed of the same materialand on the same layer.

(8). In any one of the constitutions (1) to (7), the display deviceincludes a counter substrate which faces the substrate in an opposedmanner and a liquid crystal layer which is sandwiched between thesubstrate and the counter substrate.

(9). In a display device comprising:

a substrate having a display region and picture frame regions which arearranged outside the display region and surround the display region;

a plurality of data lines which extend in the first direction and arearranged in parallel in the second direction which crosses the firstdirection on the display region of the substrate;

a plurality of gate lines which extend in the second direction and arearranged in parallel in the first direction on the display region of thesubstrate;

switching elements which are formed in the vicinity of crossing pointsbetween the data lines and the gate lines;

pixel electrodes each of which is formed in a region which is surroundedby the neighboring data lines and the neighboring gate lines; and

a plurality of storage lines which extend in the second direction, arearranged in parallel in the first direction alternately with the gatelines, and form storage capacities between the pixel electrodes and thestorage lines in the display region of the substrate;

the improvement is characterized in that the substrate includes aplurality of connection terminals which are formed on a first side andare connected to an external circuit, first and second gate-linepull-around lines which are respectively formed on the picture frameregions at second and third sides close to the first side and pull outthe plurality of gate lines in the direction toward the first side, andfirst and second common lines which are respectively formed on thepicture frame regions at the second and third sides and connect theplurality of storage lines each other,

a gate wiring pattern which is constituted of the plurality of gatelines and the first and second gate-line pull-around lines and a storagewiring pattern which is constituted of the plurality of storage linesand the first and second common lines are formed into wiring patternswhich do not cross each other,

the plurality of connection terminals includes connection terminalswhich are relevant to the gate lines, connection terminals which arerelevant to the data lines, and a feeding pad which applies a voltage tothe storage wiring pattern, and

the feeding pad is formed between the connection terminals which arerelevant to the gate lines and the connection terminals which arerelevant to the data lines.

(10). In the constitution (9), the storage wiring pattern is integrallyformed and is connected to the feeding pad.

(11). In the constitution (10), the storage wiring pattern is alsoconnected to a second feeding pad which is arranged at a positiondifferent from the position of the feeding pad.

(12). In the constitution (9), the storage wiring pattern is divided intwo portions, and one portion is connected to the feeding pad and theother portion is connected to a second feeding pad which is arranged ata position different from the position of the feeding pad.

(13). In any one of the constitutions (9) to (12), the display deviceincludes a counter substrate which faces the substrate in an opposedmanner and a liquid crystal layer which is sandwiched between thesubstrate and the counter substrate.

(14). In a display device comprising:

a substrate having a display region and picture frame regions which arearranged outside the display region and surround the display region;

a plurality of data lines which extend in the first direction and arearranged in parallel in the second direction which crosses the firstdirection on the display region of the substrate;

a plurality of gate lines which extend in the second direction and arearranged in parallel in the first direction on the display region of thesubstrate;

switching elements which are formed in the vicinity of crossing pointsbetween the data lines and the gate lines;

pixel electrodes each of which is formed in a region which is surroundedby the neighboring data lines and the neighboring gate lines; and

a plurality of storage lines which extend in the second direction, arearranged in parallel in the first direction alternately with the gatelines, and form storage capacities between the pixel electrodes and thestorage lines in the display regions of the substrate,

the improvement is characterized in that the substrate includes aplurality of connection terminals which are formed on a first side andare connected to an external circuit, first and second gate-linepull-around lines which are respectively formed on the picture frameregions at second and third sides close to the first side, and pull outthe plurality of gate lines in the direction toward the first side, andfirst and second common lines which are respectively formed on thepicture frame regions at the second and third sides, and connect theplurality of storage lines each other,

a gate wiring pattern which is constituted of the plurality of gatelines and the first and second gate-line pull-around lines and a storagewiring pattern which is constituted of the plurality of storage linesand the first and second common lines are formed into wiring patternswhich do not cross each other,

a feeding line is formed on the picture frame region at the second side,

the first gate-line pull-around line and the first common line areformed on the picture frame region at the second side, and the firstgate-line pull-around line is positioned between the first common lineand the feeding line, and

the display device further includes an auxiliary common line which isinsulated from the first gate-line pull-around line and electricallyconnects the first common line with the feeding line.

(15). In the constitution (14), the storage lines are divided into agroup which is close to the first side and a group which is remote fromthe first side, the group which is close to the first side is connectedto the first common line, and the group which is remote from the firstside is connected to the second common line.

(16). In the constitution (14) or (15), the first common line and thesecond common line are connected with each other using at least aportion of the plurality of storage lines.

(17). In any one of the constitutions (14) to (16), the plurality ofconnection terminals include a feeding pad for applying a voltage to thestorage wiring pattern.

(18). In any one of the constitutions (14) to (17), the plurality ofgate lines and the plurality of storage lines are formed of the samematerial and on the same layer.

(19). In any one of the constitutions (14) to (18), the display deviceincludes a counter substrate which faces the substrate in an opposedmanner and a liquid crystal layer which is sandwiched between thesubstrate and the counter substrate.

(20). In a display device comprising:

a substrate having a display region and picture frame regions which arearranged outside the display region and surround the display region;

a plurality of data lines which extend in the first direction and arearranged in parallel in the second direction which crosses the firstdirection on the display region of the substrate;

a plurality of gate lines which extend in the second direction and arearranged in parallel in the first direction on the display region of thesubstrate;

switching elements which are formed in the vicinity of crossing pointsbetween the data lines and the gate lines;

pixel electrodes each of which is formed in a region which is surroundedby the neighboring data lines and the neighboring gate lines; and

a plurality of storage lines which extend in the second direction, arearranged in parallel in the first direction alternately with the gatelines, and form storage capacities between the pixel electrodes and thestorage lines in the display region of the substrate,

the improvement is characterized in that the substrate includes aplurality of connection terminals which are formed on a first side andare connected to an external circuit, first and second gate-linepull-around lines which are respectively formed on the picture frameregions at second and third sides close to the first side and pull outthe plurality of gate lines in the direction toward the first side, andfirst and second common lines which are respectively formed on thepicture frame regions at the second and third sides and connect theplurality of storage lines each other,

a gate wiring pattern which is constituted of the plurality of gatelines and the first and second gate-line pull-around lines and a storagewiring pattern which is constituted of the plurality of storage linesand the first and second common lines are formed into wiring patternswhich do not cross each other,

a feeding line is formed on the picture frame region at the second side,

the first gate-line pull-around line and the first common line areformed on the picture frame region at the second side, and the firstgate-line pull-around line is positioned between the first common lineand the feeding line, and

the display device further includes an auxiliary common line which isinsulated from the first gate-line pull-around line and electricallyconnects the first common line with the feeding line,

the plurality of connection terminals include connection terminals whichare relevant to the gate lines, connection terminals which are relevantto the data lines, a first feeding pad which applies a voltage to thestorage wiring pattern and a second feeding pad which applies a voltageto the feeding line, and

the first feeding pad is formed between the connection terminals whichare relevant to the gate lines and the connection terminals which arerelevant to the data lines, and the connection terminals relevant to thegate lines are formed between the first feeding pad and the secondfeeding pad.

(21). In the constitution (20), the storage wiring pattern is integrallyformed and is connected to the first feeding pad.

(22). In the constitution (21), the storage wiring pattern is alsoconnected to a third feeding pad which is arranged at a positiondifferent from positions of the first and second feeding pads.

(23). In the constitution (20), the storage wiring pattern is formedsuch that the storage wiring pattern is divided into two portions, oneportion is connected to the first and second feeding pads and the otherportion is connected to a third feeding pad which is arranged at aposition different from positions of the first and second feeding pads.

(24). In any one of the constitutions (20) to (23), the display deviceincludes a counter substrate which faces the substrate in an opposedmanner and a liquid crystal layer which is sandwiched between thesubstrate and the counter substrate.

The present invention is not limited to the above-mentionedconstitutions and the constitutions of embodiments which will beexplained later and it is needless to say that various modification areconceivable without departing from the technical concept of the presentinvention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plan view for schematically explaining a liquid crystaldisplay device of the first embodiment of the present invention.

FIG. 2 is a plan view for schematically explaining a liquid crystaldisplay device of the second embodiment of the present invention.

FIG. 3 is a plan view for schematically explaining a liquid crystaldisplay device of the third embodiment of the present invention.

FIG. 4 is a plan view for schematically explaining a liquid crystaldisplay device of the fourth embodiment of the present invention.

FIG. 5 is a schematic view for explaining the wiring arrangement in aliquid crystal display device of the fifth embodiment of the presentinvention.

FIG. 6 is a schematic view for explaining the wiring arrangement in aliquid crystal display device of the sixth embodiment of the presentinvention.

FIG. 7 is a schematic view for explaining the wiring arrangement in aliquid crystal display device of the seventh embodiment of the presentinvention.

FIG. 8 is a schematic view for explaining the wiring arrangement in aliquid crystal display device of the eighth embodiment of the presentinvention.

FIG. 9 is a schematic view for explaining the wiring arrangement in aliquid crystal display device of the ninth embodiment of the presentinvention.

FIG. 10 is a schematic view for explaining the wiring arrangement in aliquid crystal display device of the tenth embodiment of the presentinvention.

FIG. 11 is a plan view for schematically explaining a liquid crystaldisplay device of the eleventh embodiment of the present invention.

FIG. 12 is a cross-sectional view of an auxiliary common line portiontaken along a line B–B′ in FIG. 11.

FIG. 13 is a plan view for schematically explaining a liquid crystaldisplay device of the twelfth embodiment of the present invention.

FIG. 14 is a plan view for schematically explaining a constitutionalexample of the vicinity of one pixel in a first substrate of the liquidcrystal display device of the present invention.

FIG. 15 is a cross-sectional view of the first substrate taken along aline A–A′ in FIG. 14.

FIG. 16 is a cross-sectional view showing a cross section correspondingto the cross section of the first substrate taken along the line A–A′ inFIG. 14 when the present invention is applied to a liquid crystaldisplay device having another structure.

FIG. 17 is a plan view for schematically explaining anotherconstitutional example of the vicinity of one pixel in the firstsubstrate of the liquid crystal display device of the present invention.

FIG. 18 is a cross-sectional view of the first substrate taken along aline A–A′ in FIG. 17.

FIG. 19 is a cross-sectional view corresponding to the cross section ofthe first substrate taken along the line A–A′ in FIG. 17 when thepresent invention is applied to a liquid crystal display device havingstill another structure.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Preferred embodiments of the present invention are explained in detailhereinafter in conjunction with attached drawings which describe theembodiments. In the embodiments described hereinafter, the explanationis made using a liquid crystal display device as an example of thedisplay device.

FIG. 1 is a plan view for schematically explaining a liquid crystaldisplay device of the first embodiment of the present invention. In thisliquid crystal display device, a first substrate SUB1 and a secondsubstrate SUB2 are laminated to each other and liquid crystal (not shownin the drawing) is sealed between both substrates thus forming a displayregion AR, and a periphery of the display region AR is sealed by asealing member SL. Reference symbol INJ indicates a liquid crystalfilling port and is closed by a sealing member after the liquid crystalis sealed between both substrates. Regions other than the display regionAR are referred to as picture frame regions. Here, one side (lower sidein FIG. 1) of the first substrate SUB1 is stuck out from the secondsubstrate SUB2.

On this portion which is disposed adjacent to the display region AR, adata line driving circuit (data driver; semiconductor integrated circuitor chip) DDR, gate line driving circuits (gate drivers; semiconductorintegrated circuits or chips) GDR1, GDR2, input terminals DDM, GDM1,GDM2 of these driving circuits, and various feeding pads P-PAD1, P-PAD2,P-PAD3 are formed. This portion is referred to as a driving circuitmounting region BR. To the above-mentioned input terminals DDM, GDM1,GDM2 and various feeding pads P-PAD1, P-PAD2, P-PAD3 formed on thedriving circuit mounting region BR, output terminals of a flexibleprinted circuit board not shown in the drawing are connected. Here, thedata line driving circuit and the gate line driving circuits areso-called integrated circuits and include not only chips but alsocircuits which are directly built in the substrate. The same goes forother embodiments described hereinafter.

On the display region of the first substrate SUB1, a large number ofdata lines DL which extend in the longitudinal direction (firstdirection) of this substrate and are arranged in parallel in the lateraldirection (second direction) are formed. These data lines DL areconnected to output terminals of the data driver DDR mounted on thedriving circuit mounting region BR. Further, in the same manner, on thedisplay region of the first substrate SUB1, a large number of gate linesGL which extend in the lateral direction (second direction) and arearranged in parallel in the longitudinal direction (first direction) areformed. These gate lines GL are divided into two groups GL1, GL2 in thevertical direction with respect to the display region AR, whereinrespective groups are connected to output terminals of the gate driversGDR1, GDR2 which are mounted on the driving circuit mounting region BRfor driving the above-mentioned two groups of gate lines by way ofgate-line pull-around lines GLL1, GLL2 which pass left-side andright-side picture frame regions.

In this manner, by wiring the gate lines GL in the state that the gatelines GL are divided into two groups GL1, GL2, it is possible to obtainthe so-called screen center arrangement which arranges the displayregion AR substantially at the center with respect to the left and rightdirections (horizontal direction) of the first substrate SUB1).

Although a large number of thin film transistors are provided asswitching elements to respective pixels which are formed on respectivecrossing portions between the data lines DL and the gate line GL in thedisplay region AR, they are omitted from the drawing. Further, althougheach pixel on which the thin film transistor is formed includes a pixelelectrode, this pixel electrode is also not shown in the drawing.

On an inner surface of the second substrate SUB2, counter electrodeswhich face the above-mentioned pixel electrodes in an opposed manner areformed. Further, in case of color display, color filters of a pluralityof colors are provided above or below the counter electrodes. However,the color filters are omitted from the drawing along with the counterelectrodes. The counter electrodes are connected to the feeding padsP-PAD1, P-PAD3 formed on the driving circuit mounting region BR throughcounter electrode connection pads C-PAD1, C-PAD2 formed on cornerportions of an upper side of the first substrate SUB1 and common linesB1, B2.

Storage lines STL are formed between the gate lines GL (GL1, GL2) of thefirst substrate SUB1. These storage lines STL are vertically dividedinto two groups with respect to the display region of the firstsubstrate SUB1, wherein the lower-side group is connected to the feedingpad P-PAD2 formed on the driving circuit mounting region BR through acommon line B3 formed at the left side and the upper-side group isconnected to the feeding pad P-PAD3 formed on the driving circuitmounting region BR formed at the right side through a common line B2.

Electricity is supplied to the storage lines STL through the feedingpads P-PAD2 and P-PAD3. Further, since the counter electrode connectionpads C-PAD1 and C-PAD2 are connected by the counter electrodes, it isalso true that electricity is supplied to the storage line STL throughthe counter electrode connection pads C-PAD1 and C-PAD2 and the feedingpad P-PAD1. Accordingly, even when either one of common lines B1, B2 isdisconnected or suffers from the increase of resistance, the sufficientsupply of electricity to the storage lines STL is ensured.

By constituting the liquid crystal display device as described in thisembodiment, there exists no portion on the plane of the substrate wherethe storage wiring pattern (storage lines and common lines) and the gatewiring pattern (gate lines and gate-line pull-around line) cross eachother. Accordingly, the storage lines STL and the gate lines GL can beformed on the same layer. Further, even when the storage lines STL andthe gate lines GL are formed on separate layers, there exists no portionwhere they get over each other so that it is unnecessary to consider theoccurrence of disconnection failure. Further, since the storage linesSTL and the gate lines GL are formed on the same layer, when these linesare formed by patterning using aluminum material, the anodization foravoiding the occurrence of hillock can be performed with one process sothat there is no increase of manufacturing steps. Further, respectivelines including the pull-around lines are arranged in a left-and-rightsymmetry with respect to the display region AR and hence, the displayregion AR can be also arranged at the center of the liquid crystaldisplay device.

Further, the feeding pad P-PAD2 which applies a voltage to the storagewiring pattern is formed between connection terminals (GDM1) which arerelevant to the gate lines and connection terminals (DDM) which arerelevant to the data lines and hence, feeding of electricity is possiblefrom the feeding pad P-PAD2. Accordingly, even when the storage wiringpattern is separately formed in halves as in the case of thisembodiment, feeding of electricity can be performed. Further, the gatedrivers GDR1, GDR2 and the data driver DDR may be formed as one circuitby forming them into one chip. These explanations are applicable toembodiments described hereinafter in the same manner.

In this manner, according to this embodiment, it is possible to providethe highly reliable storage-line type liquid crystal display devicewhich can obviate the increase of the manufacturing process.

FIG. 2 is a plan view for schematically explaining a liquid crystaldisplay device of the second embodiment of the present invention.Symbols which are equal to those of FIG. 1 indicate parts havingidentical functions. This embodiment relates to a constitutional examplein which only the data driver DDR is mounted on the driving circuitmounting region BR in the above-mentioned first embodiment and the gatedrivers are mounted on a flexible printed circuit board side not shownin the drawing. The arrangement of the data lines DL, the gate lines GLand the storage lines STL formed on the display region AR is similar tothe corresponding arrangement of the first embodiment and hence, therepeated explanation of the arrangement is not made.

In this embodiment, gate-line pull-around lines GLL1, GLL2 are directlyconnected to the gate terminals GTM1, GTM2 formed on the driving circuitmounting region BR. The gate terminals GTM1, GTM2 are connected tooutput terminals of gate drivers (similar to gate drivers GDR1, GDR2 inFIG. 1) mounted on a flexible printed circuit board not shown in thedrawing so as to supply gate-line driving voltages to the gate linesGL1, GL2. Accordingly, areas of various lines and pads which are formedon the driving circuit mounting region BR can be increased.

By constituting the liquid crystal display device as in the case of thisembodiment, portions on the plane of the substrate where the storagewiring pattern and the gate wiring pattern cross each other can beeliminated in the same manner as the first embodiment and hence, thestorage lines STL and the gate lines GL can be formed on the same layer.Further, even when the storage lines STL and the gate lines GL areformed on separate layers, there exists no portion where they get overeach other so that it is unnecessary to consider the occurrence ofdisconnection failure. Further, since the storage lines STL and the gatelines GL are formed on the same layer, when these lines are formed bypatterning using aluminum material, the anodization for avoiding theoccurrence of hillock can be performed with one process so that there isno increase of manufacturing steps. Further, respective lines includingthe pull-around lines are arranged in a left-and-right symmetry withrespect to the display region AR and hence, the display region AR can bealso arranged at the center of the liquid crystal display device.

Further, the feeding pad P-PAD2 which applies a voltage to the storagewiring pattern is formed between connection terminals which relate tothe gate lines (here, GTM1 different form FIG. 1) and connectionterminals (DDM) which relate to the data lines so that the feeding ofelectricity is possible from this feeding pad P-PAD2. Here, the datadrivers are also provided outside the substrate SUB1, data terminalswhich supply a data line driving voltage to the data lines DL are formedon the substrate SUB1 as the connection terminals which relate to thedata lines, and these data terminals may be connected to the output ofthe data driver. These explanations are also applicable to theembodiments described hereinafter in the same manner.

In this manner, according to this embodiment, in the same manner as thefirst embodiment, it is possible to provide the highly reliable storageline type liquid crystal display device without increasing themanufacturing process.

FIG. 3 is a plan view for schematically explaining a liquid crystaldisplay device of the third embodiment of the present invention. Symbolswhich are equal to those of FIG. 1 and FIG. 2 indicate parts havingidentical functions. The liquid crystal display device is characterizedin that in place of the arrangement of gate lines shown in FIG. 1 orFIG. 2, the gate lines GL1, GL2 of respective groups which are driven bythe gate drivers GDR1, GDR2 extend alternately from both left and rightsides with respect to the display region AR. Due to such an arrangementof the gate lines GL1, GL2, the storage lines STL which are divided intotwo groups, that is, upper and lower groups can be connected by thecommon lines B2 or B3 every two other lines one gate line between them.

That is, electricity is supplied to the upper group of storage lines STLfrom the feeding pad P-PAD3 through the counter electrode connection padC-PAD2 and the common line B2, while electricity is supplied to thelower group of storage lines STL from the feeding pad P-PAD2 through thecommon line B3. Here, it is possible to connect the common line B2 tothe feeding pad P-PAD3 without going through the counter electrodeconnection pad C-PAD2.

According to this embodiment, at least a portion of a plurality ofstorage lines STL can form a pattern with no wiring get-over byconnecting the common line in the left-side picture frame region and thecommon line in the right-side picture frame region. Here, in thisembodiment, the storage wiring pattern is arranged in a zigzag shapebetween common lines of both left and right sides. In this embodimentthe storage lines STL are made to move in a zigzag pattern as a pairconsisting of two storage lines. However, three or more storage linesmay be combined into a set and is formed in a zigzag pattern. Theseexplanations are applicable to embodiments which will be explainedlater.

By constituting the liquid crystal display device as described in thisembodiment, portions on the plane of the substrate where the storagewiring pattern and the gate wiring pattern cross each other can beeliminated in the same manner as the first embodiment and the secondembodiment and hence, the storage lines STL and the gate lines GL can beformed on the same layer. Further, even when the storage lines STL andthe gate lines GL are formed on separate layers, there exists no portionwhere they get over each other so that it is unnecessary to consider theoccurrence of disconnection failure. Further, since the storage linesSTL and the gate lines GL are formed on the same layer, the anodizationfor avoiding the occurrence of hillock which may take place when theselines are formed by patterning using aluminum material can be performedwith one process. Accordingly, there is no increase of manufacturingsteps. Further, respective lines including the pull-around lines arearranged in a left-and-right symmetry with respect to the display regionAR and hence, the display region AR can be also arranged at the centerof the liquid crystal display device.

Due to this embodiment, in the same manner as the first embodiment andthe second embodiment, it is possible to provide the highly reliablestorage-line type liquid crystal display device which can obviate theincrease of the manufacturing process.

FIG. 4 is a plan view for schematically explaining a liquid crystaldisplay device of the fourth embodiment of the present invention.Symbols which are equal to those of FIG. 3 indicate parts havingidentical functions. This embodiment relates to a constitutional examplein which only the data driver DDR is mounted on the driving circuitmounting region BR in the above-mentioned third embodiment and the gatedrivers are mounted on a flexible printed circuit board side not shownin the drawing. The arrangement of the data lines DL, the gate lines GLand the storage lines STL formed on the display region AR is similar tothe corresponding arrangement of the third embodiment and hence, therepeated explanation of the arrangement is not made.

In this embodiment, gate-line pull-around lines GLL1, GLL2 are directlyconnected to the gate terminals GTM1, GTM2 formed on the driving circuitmounting region BR. The gate terminals GTM1, GTM2 are connected tooutput terminals of gate drivers (similar to gate drivers GDR1, GDR2 inFIG. 1) mounted on a flexible printed circuit board not shown in thedrawing so as to supply gate-line driving voltages to the gate linesGL1, GL2. Accordingly, areas of various lines and pads which are formedon the driving circuit mounting region BR can be increased.

By constituting the liquid crystal display device as described in thisembodiment, portions on the plane of the substrate where the storagewiring pattern and the gate wiring pattern cross each other can beeliminated in the same manner as the third embodiment and hence, thestorage lines STL and the gate lines GL can be formed on the same layer.Further, even when the storage lines STL and the gate lines GL areformed on separate layers, there exists no portion where they get overeach other so that it is unnecessary to consider the occurrence ofdisconnection failure. Further, since the storage lines STL and the gatelines GL are formed on the same layer, the anodization for avoiding theoccurrence of hillock which may take place when these lines are formedby patterning using aluminum material can be performed with one process.Accordingly, there is no increase of manufacturing steps. Further,respective lines including the pull-around lines are arranged in aleft-and-right symmetry with respect to the display region AR and hence,the display region AR can be also arranged at the center of the liquidcrystal display device.

Due to this embodiment, in the same manner as the first to the thirdembodiments, it is possible to provide the highly reliable storage-linetype liquid crystal display device which can obviate the increase of themanufacturing process.

FIG. 5 is a schematic view for explaining the wiring arrangement of aliquid crystal display device according to the fifth embodiment of thepresent invention. Symbols which are equal to those of FIG. 1 and FIG. 2indicate parts having identical functions. In the above-mentioned liquidcrystal display devices of the first embodiment and the secondembodiment, it is assumed that the storage lines STL which are dividedinto a plurality of groups in the vertical direction of the displayregion AR are physically independent from each other within the displayregion AR. In this embodiment, a common line B4 for a group of storagelines STL which is formed by dividing corresponding to the first groupof gate lines GL1 and a common line B3 for a group of storage lines STLwhich is formed by dividing corresponding to the second group of gatelines GL2 are connected to both ends of the storage line STL within thedisplay region AR thus physically connecting these groups of storagelines STL. Here, the common line B4 may be substituted by the commonline B2. However, the crossing of wiring is prohibited. The same goesfor embodiments described hereinafter.

By connecting the storage lines STL of divided groups in this manner, inaddition to the above-mentioned advantageous effects of respectiveembodiments, the feeding of electricity can be ensured even when theconnection failure occurs with respect to one feeding path. Further,since electricity can be supplied at both ends of the storage line STL,the waveform of voltage supplied to the storage line STL is preventedfrom becoming dull. Accordingly, it is possible to provide the highlyreliable storage line type liquid crystal display device.

As described in this embodiment, by connecting the common line of theleft-side picture frame region and the common line of the right-sidepicture frame region using at least a portion of a plurality of storagelines STL, it is possible to form the pattern having no wiring get-over.Further, when the storage wiring patterns are integrally formed as inthe case of this embodiment, it is not always necessary to feedelectricity from both ends and electricity may be supplied only from thefeeding pad P-PAD2, for example. The same goes for embodiments describedhereinafter.

FIG. 6 is a schematic view for explaining the wiring arrangement of aliquid crystal display device according to the sixth embodiment of thepresent invention. Symbols which are equal to those of FIG. 5 indicateparts having identical functions. As described above, in the liquidcrystal display devices of the first embodiment and the secondembodiment, it is assumed that the storage lines STL which are dividedinto a plurality of groups in the vertical direction of the displayregion AR are physically independent from each other within the displayregion AR. According to this embodiment, in the same manner as the fifthembodiment, a common line B4 for a group of storage lines STL which isformed by dividing corresponding to the first group of gate lines GL1and a common line B3 for a group of storage lines STL which is formed bydividing corresponding to the second group of gate lines GL2 areconnected to both ends of the storage line STL within the display regionAR thus physically connecting these groups of storage lines STL.Further, the common line B3 for a group of storage lines STL which isformed by dividing corresponding to the second group of gate lines GL2is not provided with the feeding pad. Accordingly, electricity issupplied to these storage lines STL also from the feeding pad P-PAD3.

According to this embodiment, the number of pads formed on the drivingcircuit mounting region BR can be reduced and it is possible to providethe highly reliable storage line type liquid crystal display device bymaking use of the space of the driving circuit mounting region BR.

FIG. 7 is a schematic view for explaining the wiring arrangement of aliquid crystal display device according to the seventh embodiment of thepresent invention. Symbols which are equal to those of FIG. 5 and FIG. 6indicate parts having identical functions. In the liquid crystal displaydevices of the above-mentioned third embodiment or fourth embodiment,the storage lines STL are vertically divided into a plurality of groupsin the display region AR, and a plurality of groups of storage lines STLare physically independent from each other within the display region AR.However, in this embodiment, these groups of storage lines STL arephysically connected to each other.

By connecting the storage lines STL of divided groups in this manner, inthe same manner as the above-mentioned fifth embodiment, the feeding ofelectricity can be ensured even when the connection failure occurs withrespect to one feeding path. Further, since electricity can be suppliedat both ends of the storage line STL, the waveform of voltage suppliedto the storage line STL is prevented from becoming dull. Accordingly, itis possible to provide the highly reliable storage line type liquidcrystal display device.

FIG. 8 is a schematic view for explaining the wiring arrangement of aliquid crystal display device according to the eighth embodiment of thepresent invention. Symbols which are equal to those of FIG. 7 indicateparts having identical functions. This embodiment is characterized byhaving bridging lines BCL1, BCL2 which respectively connect common linesB3, B4 of storage lines STL in FIG. 7. These bridging lines BCL1, BCL2are formed over the gate lines GL and the storage lines STL by way of aninsulation layer. Contact holes are formed in the insulation layer atpositions of the common lines B3, B4. Accordingly, although the processfor forming the bridging lines BCL1, BCL2 is added, electricity can besurely supplied to the storage lines STL whereby the liquid crystaldisplay device having increased reliability can be provided. When thestorage lines STL are formed on the same layer as the data lines DL, theincrease of process can be obviated.

FIG. 9 is a schematic view for explaining the wiring arrangement of aliquid crystal display device according to the ninth embodiment of thepresent invention. This embodiment is configured such that the feedingpad P-PAD2 in the above-mentioned seventh embodiment is removed andelectricity is supplied to the storage lines STL through the feeding padP-PAD3 in the same manner as the embodiment 6.

According to this embodiment, the number of pads formed on the drivingcircuit mounting region BR can be reduced so that the space of thedriving circuit mounting region BR is effectively used thus providingthe highly reliable storage line type liquid crystal display device.

FIG. 10 is a schematic view for explaining the wiring arrangement of aliquid crystal display device according to the tenth embodiment of thepresent invention. This embodiment is characterized by providing thebridging lines BCL1, BCL2 which have been explained with respect to theeighth embodiment to the above-mentioned ninth embodiment. Thesebridging lines BCL1, BCL2 are also formed over the gate lines GL and thestorage lines STL by way of an insulation layer in the same manner asthe wiring arrangement shown in FIG. 8. Contact holes are formed in theinsulation layer at positions of the common lines B3, B4. Accordingly,although the process for forming the bridging lines BCL1, BCL2 isincreased in number, electricity can be surely supplied to the storagelines STL whereby the liquid crystal display device having increasedreliability can be provided. When the storage lines STL are formed onthe same layer as the data lines DL, the increase of process can beobviated. With respect to other constitutions and advantageous effects,they are equal to those of the ninth embodiment.

FIG. 11 is a plan view for schematically explaining the wiringarrangement of a liquid crystal display device according to the eleventhembodiment of the present invention, wherein this embodiment constitutesa modification of the embodiment shown in FIG. 1. That is, thisembodiment is constituted such that the data line driving circuit DDRand two gate line driving circuits GDR1, GDR2 are mounted on the drivingcircuit mounting region BR. Symbols which are equal to those of theabove-mentioned embodiments indicate parts having identical functions.In the liquid crystal display device having the constitution shown inthe previous FIG. 1 and FIG. 2 or FIG. 5 and FIG. 6, that is, theconstitution in which the storage lines are vertically divided into twogroups in the effective region, the feeding resistance of wiring maydiffer between these groups of storage lines. For example, there may bea case that a portion of the line which connects the feeding pad P-PAD2and the common line B3 is narrow. Due to the difference of voltagederived from this difference in resistance, there arises difference inbrightness between pixels arranged at upper and lower portion of thescreen which are connected to the upper and lower storage lines thusdegrading image qualities.

The basic wiring structure shown in FIG. 11 is substantially equal tothe basic wiring structure shown in FIG. 1. In this liquid crystaldisplay device, at the left-side picture frame region of the displayregion AR as viewed facing FIG. 11, a large number of gate-linepull-around lines GLL1 are provided. At both sides of the gate-linepull-around lines GLL1, the common line B1 which connects the counterelectrode connection pad C-PAD1 to the feeding pad P-PAD1 and the commonline B3 which connects lower-side storage lines STL in common arearranged. Accordingly, it is difficult for the wiring area of the commonline B3 to ensure the sufficient wiring width compared to the commonline B2 which is formed on the right-side picture frame region of thedisplay region AR as viewed facing FIG. 11. As a result, there arisesthe above-mentioned difference in brightness between the pixels in theupper and lower portions of the screen.

In this embodiment, the common line B1 which connects the counterelectrode connection pad C-PAD1 to the feeding pad P-PAD1 and the commonline B3 which connects the lower-side storage lines STL in common areelectrically connected by the auxiliary common line CBL. In this case,the common line B1 may be referred to as the feeding line. The counterelectrode connection pad C-PAD1 is connected to the feeding pad P-PAD3arranged at the right-side of the display region AR by way of thecounter electrodes formed on the second substrate SUB2. Due to such aconstitution, the potential of the lower-side storage lines STL whichare connected to the common line B1 becomes substantially equal to thepotential of the upper-side storage lines STL. Here, it is defined thatthe auxiliary common line CBL does not constitute the constitutionalelement of the storage wiring pattern. Accordingly, the gate wiringpattern and the storage wiring pattern do not cross each other.

FIG. 12 is a cross-sectional view of a portion of the auxiliary commonline taken along a line B–B′ in FIG. 11. The auxiliary common line CBLstrides the gate-line pull-around lines GLL1 and is electricallyconnected to the common lines B1 and B3. The auxiliary common line CBLis insulated from the gate-line pull-around lines GLL1 by means of agate insulation layer GI. Although the auxiliary common line CBL may beformed of an independent conductor, it is preferable to form theauxiliary common line CBL using the same conductive material as the datalines DL. In this case, the auxiliary common line CBL can besimultaneously formed with the data lines DL in the patterning step ofthe data lines DL. That is, after forming the gate lines and thegate-line pull-around lines GLL1, the gate lines and the gate-linepull-around lines GLL1 are covered with the gate insulation layer GI,contact holes are formed in the gate insulation layer GI at connectionportions with the common lines B1 and B3, and the auxiliary common lineCBL which is bridged to the common line B1 and B3 is formed at the timeof patterning the data lines DL. It is preferable to form the gatewiring pattern and the storage wiring pattern using the same materialand on the same layer.

According to this embodiment, the difference in voltage derived from thedifference in resistance between the common lines B2 and B3 which supplyelectricity to the upper and lower storage lines can be alleviated sothat the difference in brightness of the pixels which are connected tothese upper and lower storage lines can be alleviated whereby the imagequality can be enhanced. Further, the upper-side storage lines and thelower-side storage lines may be connected at a point P shown in FIG. 11.Further, due to such a constitution, the feeding pad P-PAD2 formed onthe driving circuit mounting region may be eliminated. In this case, thetolerance of arrangement of space for terminals for connection with anexternal circuit can be increased.

FIG. 13 is a plan view for schematically explaining a liquid crystaldisplay device of the twelfth embodiment of the present invention. Thisembodiment corresponds to a modification of the embodiment shown in FIG.2 and can overcome drawbacks similar to the drawbacks which areexplained in conjunction with FIG. 11. In the drawing, symbols which areequal to those of the previously mentioned respective embodimentsindicate parts having identical functions.

The basic wiring structure shown in FIG. 13 is substantially equal tothe wiring structure shown in FIG. 2. That is, in the same manner asFIG. 2, only the data line driving circuit DDR is mounted on the drivingcircuit mounting region BR. Also in this liquid crystal display device,at the left-side picture frame region of the display region AR as viewedfacing FIG. 13, a large number of gate-line pull-around lines GLL1 areprovided. At both sides of the gate-line pull-around lines GLL1, thecommon line B1 which connects the counter electrode connection padC-PAD1 to the feeding pad P-PAD1 and the common line B3 which connectslower-side storage lines STL in common are arranged. Accordingly, it isdifficult for the wiring area of the common line B3 to ensure thesufficient wiring width compared to the common line B2 which is formedon the right-side picture frame region of the display region AR asviewed facing FIG. 13. As a result, there arises the above-mentioneddifference in brightness between the pixels in the upper and lowerportions of the screen.

In this embodiment, the common line B1 which connects the counterelectrode connection pad C-PAD1 to the feeding pad P-PAD1 and the commonline B3 which connects the lower-side storage lines STL in common areelectrically connected by the auxiliary common line CBL. The counterelectrode connection pad C-PAD1 is connected to the feeding pad P-PAD3arranged at the right-side of the display region AR by way of thecounter electrodes formed on the second substrate SUB2. Due to such aconstitution, the potential of the lower-side storage lines STL whichare connected to the common lien B1 becomes substantially equal to thepotential of upper-side storage lines STL. The cross-sectional structureof the auxiliary common line CBL taken along a line B–B′ in FIG. 13 isequal to the cross-sectional structure shown in FIG. 12. Further, withrespect to other constitutions and advantageous effects, they aresimilar to those obtained by the liquid crystal display device shown inFIG. 11.

FIG. 14 is a plan view for schematically explaining a constitutionalexample of the vicinity of one pixel on the first substrate of theliquid crystal display device according to the present invention. In thedrawing, symbol DL indicates data lines, symbol GL indicates gate lines,symbol STL indicates a storage line, symbol ITO indicates a pixelelectrode, symbol TFT indicates a thin film transistor and symbol Cstgindicates a storage capacity. A pixel is formed in a region surroundedby two data lines DL and two gate lines GL. The pixel includes theabove-mentioned pixel electrode ITO which is driven by the thin filmtransistor TFT and a counter electrode not shown in the drawing which ismounted on the second substrate.

The storage line STL is formed close to and parallel to the gate lineGL. The storage capacity Cstg is formed at a portion where the storageline STL and the pixel electrode ITO overlap each other. In FIG. 14,although the width of the storage line STL which is served for formingthe storage capacity Cstg is enlarged within the pixel, it is not alwaysnecessary to enlarge the width of the storage line STL. That is,depending on the characteristics of a dielectric (insulation layer)which is provided between the storage line STL and the pixel electrodeITO, the storage line STL may be formed in a straight line.

Further, the position where the storage capacity Cstg is formed is notlimited to a portion shown in the drawing. For example, with respect toa reflection type liquid crystal display device, a partial transmissiontype liquid crystal display device or a semi-transmission type liquidcrystal display device which does not require the consideration ofnumerical aperture compared to the transmission type liquid crystaldisplay device which requires consideration on numerical aperture, thestorage line may be allowed to pass the central portion of the pixel.The storage lines STL are formed in the arrangement explained inconjunction with FIG. 1 to FIG. 13. In FIG. 14, the semiconductor layerSI and the like are omitted.

FIG. 15 is a cross-sectional view of the first substrate taken along aline A–A′ in FIG. 14. Symbols which are equal to those of FIG. 14indicate parts having identical functions. In the drawing, symbol SUB1indicates the first substrate and the gate electrode G which is extendedfrom the gate line and the storage line STL are formed on the firstsubstrate SUB1. The gate electrode G and the storage line STL arecovered with the gate insulation layer GI (for example, SiN), and thethin film transistor TFT which is constituted of the semiconductor layerSI, the drain electrode SD1 and the source electrode SD2 is formed overthe gate electrode G. Here, an oxide film AO which is formed byanodization is formed on the surfaces of the gate electrode G includingthe gate line and the storage line STL. Here, the semiconductor layer SImay be formed of either amorphous silicon (a-Si) or polysilicon (p-Si)to provide the thin film transistor structure which matchescharacteristics of each material. In this embodiment, the semiconductorlayer SI is formed of amorphous silicon (a-Si).

A passivation layer PAS is formed over the gate insulation layer GIincluding the thin film transistor TFT such that the passivation layerPAS covers the whole surface of the pixel region. The pixel electrodeITO is formed over the passivation layer PAS. Since the liquid crystaldisplay device is a so-called transmission type liquid crystal displaydevice, a transparent conductive film is used as the pixel electrode insuch a constitution. The pixel electrode ITO is connected to the sourceelectrode SD2 via a through hole formed in the passivation layer PAS.Further, the pixel electrode ITO extends over the storage line STL andforms the storage capacity Cstg together with the storage line STL.

FIG. 16 is a cross-sectional view showing a cross section correspondingto a cross section of the first substrate taken along a line A–A′ inFIG. 14 when the present invention is applied to a liquid crystaldisplay device having other structure. Symbols which are equal to thoseof FIG. 15 indicate parts having identical functions. In FIG. 16, thepassivation layer PAS and the through hole are not formed on the pixelregion. With respect to other constitutions and advantageous effects,they are similar to those obtained by the liquid crystal display deviceshown in FIG. 15.

FIG. 17 is a plan view for schematically explaining anotherconstitutional example of the vicinity of one pixel of the firstsubstrate of the liquid crystal display device according to the presentinvention. Also in FIG. 17, the illustration of semiconductor layer SIand the like is omitted. Further, FIG. 18 is a cross sectional view ofthe first substrate taken along a line A–A′ in FIG. 17. This liquidcrystal display device is a so-called partial transmission type liquidcrystal display device. In the pixel structure explained in conjunctionwith FIG. 14 to FIG. 16, assuming the passivation layer which covers thegate insulation layer GI as the first passivation layer PAS1, areflection electrode RF is formed over the pixel electrode by way of thesecond passivation layer PAS2. Here, the second passivation layer PAS2may be omitted.

The reflection electrode RF is preferably formed of a metal thin film.By removing a portion of the pixel region together with the secondpassivation layer PAS2 formed below the pixel region, an aperture TP isformed in the reflection electrode RF. When the liquid crystal displaydevice functions as the transmission type liquid crystal display device,light (external light or light from backlight) which enters from theback surface side of the first substrate SUB1 is allowed to transmit orpass through in the direction toward the second substrate. When theliquid crystal display device functions as the reflection type liquidcrystal display device, an external light (or light from a so-calledfront light) which is incident from the second substrate side isreflected on the reflection electrode RF and is irradiated to the secondsubstrate side so as to perform an image display.

When the liquid crystal display device functions simultaneously as thetransmission type liquid crystal display device and the reflection typeliquid crystal display device, light from the back surface side of thefirst substrate SUB1 is irradiated to the second substrate side from theaperture TP of the above-mentioned reflection electrode RF and, at thesame time, light which is incident from the second substrate SUB2 sideis reflected on the reflection electrode RF and is irradiated in thedirection toward the second substrate.

As shown in FIG. 17 and FIG. 18, with respect to the reflectionelectrode RF, a slit S is positioned over the storage line STL andbetween the reflection electrode RF and the reflection electrode of theneighboring pixel. A slit S is positioned also over the drain line DLand between the reflection electrode RF and the neighboring reflectionelectrode. By adopting such an arrangement, it is possible to preventleaking of light from the backlight at a boundary between the pixel andthe neighboring pixel at the time of performing the transmission typedisplay so that a favorable contrast can be obtained.

FIG. 19 is a cross-sectional view showing a cross section correspondingto a cross section of the first substrate taken along a line A–A′ inFIG. 17 when the present invention is applied to a liquid crystaldisplay device having still another structure. Symbols which are equalto those of FIG. 17 indicate parts having identical functions. In FIG.19, the passivation layer PAS is not formed in the pixel region and thepixel electrode ITO is directly formed on the first substrate SUB1. Thepassivation layer PAS which is formed below the reflection electrode RFis removed at the pixel region. With respect to other constitutions andadvantageous effects, they are similar to those obtained by the liquidcrystal display device shown in FIG. 17 and FIG. 18 except for that theliquid crystal display device shown in FIG. 19 has no passivation layerPAS2.

Here, besides the above-mentioned liquid crystal display devices ofvarious types, by providing the reflection electrode RF formed of ametal film or the like in place of the pixel electrode ITO formed of thetransparent conductive film shown in FIG. 14 to 16, it is possible toprovide a reflection type liquid crystal display device. Further, byforming the pixel electrode using semitransparent reflection electrode,the semi-transmission type liquid crystal display device can beconstituted. Still further, the present invention is not limited to therelatively miniaturized liquid crystal display device used for theabove-mentioned portable terminals or the like. It is needless to saythat the present invention is similarly applicable to the liquid crystaldisplay device used as a display device for a notebook type personalcomputer or other monitoring device. Further, the present invention isnot limited to the liquid crystal display device and is applicable tothe display device of other type such as an organic EL display, forexample.

As has been explained in detail in conjunction with embodimentsheretofore, the present invention adopts the constitution in which thegate wiring pattern and the storage wiring patter do not overlap eachother and hence, the patterns which have no get-over of wiring can beformed. Further, even when the storage lines are divided into upper andlower groups on the display region, the brightness difference over theentire area of the display region can be attenuated whereby it ispossible to provide the display device which is capable of exhibitinghigh quality display.

1. A display device comprising: a substrate; a plurality of pixels whichare arranged in a matrix in a display region and have a storage capacityin each pixel; a plurality of gate lines which are arranged in thedisplay region; a plurality of data lines which are arranged in thedisplay region and cross the plurality of gate lines; and a plurality ofstorage lines which are arranged in the display region and supplyelectricity to the storage capacity, wherein the substrate includes afirst side where a plurality of connection terminals which are connectedto an external circuit are provided, a second and third side which areadjacent to the first side and are opposite to each other whilesandwiching the display region therebetween, the plurality of gate linesinclude a first gate line, a second gate line which is arranged at aposition closer to the first side than the first gate line, a third gateline which is arranged at a position closer to the first side than thesecond gate line, a fourth gate line which is arranged at a positioncloser to the first side than the third gate line, a fifth gate linewhich is arranged at a position closer to the first side than the fourthgate line, the first, third and fifth gate line are respectively pulledaround to a direction where the first side exists by a first, third andfifth gate-line pull-around line which are provided at the second side,the second and fourth gate line are respectively pulled around to adirection where the first side exists by a second and fourth gate-linepull-around line which are provided at the third side, the plurality ofstorage lines include a first storage line which is arranged between thefirst gate line and the second gate line, a second storage line which isarranged between the second gate line and the third gate line, a thirdstorage line which is arranged between the third gate line and thefourth gate line, a fourth storage line which is arranged between thefourth gate line and the fifth gate line, the first storage line and thesecond storage line are connected to each other by a first common linewhich is provided at the second side, the second storage line and thethird storage line are connected to each other by a second common linewhich is provided at the third side, and the third storage line and thefourth storage line are connected to each other by a third common linewhich is provided at the second side.
 2. A display device according toclaim 1, wherein the first common line and the third common line areelectrically connected to each other by a first bridging line which isprovided at a layer different from a layer where the first and thirdcommon line are provided.
 3. A display device according to claim 2,wherein the first bridging line is provided at the second side.
 4. Adisplay device according to claim 3, wherein the plurality of gate linesinclude a sixth gate line which is arranged at a position closer to thefirst side than the fifth gate line. the sixth gate line is pulledaround to the direction where the first side exists by a sixth gate-linepull-around line which are provided at the third side, the plurality ofstorage lines include a fifth storage line which is arranged between thefifth gate line and the sixth gate line, and the fourth storage line andthe fifth storage line are connected to each other by a fourth commonline which is provided at the third side.
 5. A display device accordingto claim 4, wherein the second common line and the fourth common lineare electrically connected to each other by a second bridging line whichis provided at a layer different from a layer where the second andfourth common line are provided.
 6. A display device according to claim5, wherein the second bridging line is provided at the third side.
 7. Adisplay device according to claim 1, wherein the plurality of connectionterminals include a feeding pad which applies a voltage to the storageline.
 8. A display device according to claim 1, wherein the plurality ofthe gate lines and the plurality of storage lines are formed of the samematerial at the same layer.
 9. A display device according to claim 1,wherein the first gate line and the second gate line are gate lineswhich are adjacent to each other, the second gate line and the thirdgate line are gate lines which are adjacent to each other, the thirdgate line and the fourth gate line are gate lines which are adjacent toeach other, and the fourth gate line and the fifth gate line are gatelines which are adjacent to each other.
 10. A display device accordingto claim 1, wherein the display device includes a counter substratewhich faces the substrate in an opposed manner and a liquid crystallayer which is sandwiched between the substrate and the countersubstrate.
 11. A display device according to claim 10, wherein thesubstrate includes a pixel electrode, the counter substrate includes acounter electrode, and an electric field is applied to the liquidcrystal layer by the pixel electrode and the counter electrode.
 12. Aliquid crystal display device comprising: a first substrate whichincludes a pixel electrode; a second substrate which faces the firstsubstrate in an opposed manner and includes a counter electrode; aliquid crystal layer which is sandwiched between the first substrate andthe second substrate and an electric field is applied to the liquidcrystal layer by the pixel electrode and the counter electrode; aplurality of pixels which are arranged in a matrix in a display regionand have a storage capacity in each pixel; a plurality of gate lineswhich are arranged in the display region; a plurality of data lineswhich are arranged in the display region and cross the plurality of gatelines; and a plurality of storage lines which are arranged in thedisplay region and supply electricity to the storage capacity, whereinthe first substrate includes a first side where a plurality ofconnection terminals which are connected to an external circuit areprovided, a second and third side which are adjacent to the first sideand are opposite to each other while sandwiching the display regiontherebetween, the plurality of gate lines include a first gate line, asecond gate line which is arranged at a position closer to the firstside than the first gate line, a third gate line which is arranged at aposition closer to the first side than the second gate line, a fourthgate line which is arranged at a position closer to the first side thanthe third gate line, a fifth gate line which is arranged at a positioncloser to the first side than the fourth gate line, the first, third andfifth gate line are respectively pulled around to a direction where thefirst side exists by a first, third and fifth gate-line pull-around linewhich are provided at the second side, the second and fourth gate lineare respectively pulled around to a direction where the first sideexists by a second and fourth gate-line pull-around line which areprovided at the third side, the plurality of storage lines include afirst storage line which is arranged between the first gate line and thesecond gate line, a second storage line which is arranged between thesecond gate line and the third gate line, a third storage line which isarranged between the third gate line and the fourth gate line, a fourthstorage line which is arranged between the fourth gate line and thefifth gate line, the first storage line and the second storage line areconnected to each other by a first common line which is provided at thesecond side, the second storage line and the third storage line areconnected to each other by a second common line which is provided at thethird side, and the third storage line and the fourth storage line areconnected to each other by a third common line which is provided at thesecond side.
 13. A liquid crystal display device according to claim 12,wherein the first common line and the third common line are electricallyconnected to each other by a first bridging line which is provided at alayer different from a layer where the first and third common line areprovided.
 14. A liquid crystal display device according to claim 13,wherein the first bridging line is provided at the second side.
 15. Aliquid crystal display device according to claim 14 wherein theplurality of gate lines include a sixth gate line which is arranged at aposition closer to the first side than the fifth gate line, the sixthgate line is pulled around to the direction where the first side existsby a sixth gate-line pull-around line which are provided at the thirdside, the plurality of storage lines include a fifth storage line whichis arranged between the fifth gate line and the sixth gate line, and thefourth storage line and the fifth storage line are connected to eachother by a fourth common line which is provided at the third side.
 16. Aliquid crystal display device according to claim 15, wherein the secondcommon line and the fourth common line are electrically connected toeach other by a second bridging line which is provided at a layerdifferent from a layer where the second and fourth common line areprovided.
 17. A liquid crystal display device according to claim 16,wherein the second bridging line is provided at the third side.
 18. Aliquid crystal display device according to claim 12, wherein theplurality of connection terminals include a feeding pad which applies avoltage to the storage line.
 19. A liquid crystal display deviceaccording to claim 12, wherein the plurality of the gate lines and theplurality of storage lines are formed of the same material at the samelayer.
 20. A liquid crystal display device according to claim 12,wherein the first gate line and the second gate line are gate lineswhich are adjacent to each other, the second gate line and the thirdgate line are gate lines which are adjacent to each other, the thirdgate line and the fourth gate line are gate lines which are adjacent toeach other, and the fourth gate line and the fifth gate line are gatelines which are adjacent to each other.